Weiss was born in Pforzheim, Grand Duchy of Baden, German Empire in 1885. He was a graduate of the University of Heidelburg and the Sorbonne. He first visited the United States in 1910 later returning to Germany. He served as an artillery captain in the First World War. After the war he moved to New York City in 1930 and became prosperous through real estate investments. During World War II, Weiss was declared an “enemy alien” and was imprisoned in the camp at Ellis Island. After his release he was in contact with the newly formed Socialist Reich Party in Germany.

Weiss was influenced by the writings of Francis Parker Yockey pro-Russian stance in the 1950s and he wrote a series of articles in support of Russia in NRP publications starting in 1955. He favored a German-Russian postwar alliance against the United States.

Weiss ran a publishing group called Le Blanc Publications with political ally H. Keith Thompson. He helped to distribute Yockey’s article "What is Behind the Hanging of the Eleven Jews in Prague?"